where \(m_{R}\)  and \(m_{I}\)  are the masses of \(\Re \eta ^0/\sqrt{2}\)  and \(\Im \eta ^0/\sqrt{2}\) . In this paper, we focus on another interesting scenario given in Ref.[1]}. i.e \(m_{R}^2, m_{I}^2\gg M_{Nk}^2\) . In this case, the expression of neutrino mass matrix is given by
\(\begin{split}(M_{\nu })_{\alpha \beta }&\simeq -\frac{1}{32\pi ^{2}}\frac{\lambda v^2}{m_{0}^2}\sum _{k}h_{\alpha i}V_{ik}h_{\beta j}V_{jk}M_{Nk}\\&=-\frac{1}{32\pi ^{2}}\frac{\lambda v^2}{m_{0}^2}(hM_{N}h^{T})_{\alpha \beta }\end{split}\) 
